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Superposition of the six subunits in the asymmetric unit of the HsCutA1 crystal. Circled area 1, kink in the β2-strand at the position of Pro101 and Gln102. Circled area 2, β-hairpins of the protomers; these are flexible in solution and can adopt various conformations upon crystal packing. Circled area 3, packing peculiarity of His141 and Pro142 in the D subunit (coloured yellow).
